inc.bait.jubilee.model.helper.TransitionHelper.java Source code

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Here is the source code for inc.bait.jubilee.model.helper.TransitionHelper.java

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/*
 *
 *  * Copyright 2017 Bait Inc
 *  * Licensed under the Apache License, Version 2.0 Jubilee 2017;
 *  * you may not use this file except in compliance with the License.
 *  * You may obtain a copy of the License at
 *  *     http://www.apache.org/licenses/LICENSE-2.0
 *  * Unless required by applicable law or agreed to in writing,
 *  * software distributed under the License is distributed on an "AS IS" BASIS,
 *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  * See the License for the specific language governing permissions and
 *  *  limitations under the License.
 *
 */

package inc.bait.jubilee.model.helper;

import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.RequiresApi;
import android.support.v4.util.Pair;
import android.view.View;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import inc.bait.jubilee.ui.activity.JubileeActivity;

/**
 * Created by yoctopus on 12/20/16.
 */

public class TransitionHelper {

    /**
     * Create the transition participants required during a activity transition while
     * avoiding glitches with the system UI.
     *
     * @param activity The activity used as start for the transition.
     * @param includeStatusBar If false, the status bar will not be added as the transition
     *        participant.
     * @return All transition participants.
     */
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public static Pair[] createSafeTransitionParticipants(@NonNull JubileeActivity activity,
            boolean includeStatusBar, @Nullable Pair... otherParticipants) {
        // Avoid system UI glitches as described here:
        // https://plus.google.com/+AlexLockwood/posts/RPtwZ5nNebb
        View decor = activity.getWindow().getDecorView();
        View statusBar = null;
        if (includeStatusBar) {
            statusBar = decor.findViewById(android.R.id.statusBarBackground);
        }
        View navBar = decor.findViewById(android.R.id.navigationBarBackground);

        // Create pair of transition participants.
        List<Pair> participants = new ArrayList<>(3);
        addNonNullViewToTransitionParticipants(statusBar, participants);
        addNonNullViewToTransitionParticipants(navBar, participants);
        // only add transition participants
        // if there's at least one none-null element
        if (otherParticipants != null && !(otherParticipants.length == 1 && otherParticipants[0] == null)) {
            participants.addAll(Arrays.asList(otherParticipants));
        }
        return participants.toArray(new Pair[participants.size()]);
    }

    private static void addNonNullViewToTransitionParticipants(View view, List<Pair> participants) {
        if (view == null) {
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            participants.add(new Pair<>(view, view.getTransitionName()));
        }
    }

}